Karen X Cheng was a program manager on Excel. She just quit to take a new job as a designer at Justin Kan's new startup, Exec, which is similar to TaskRabbit -- a way for busy people to outsource tasks like moving a couch.

Cheng is also a singer, so she recorded this farewell video, dedicated to her old team. No bombshells, just a heartfelt goodbye. (Cheng also posted the video on her personal blog, but it's down right now....)